we have no comment on this from the u.s. but the iranians claim they brought down what's known as a scan eagle drone, after it violated iranian air space. it's right now in an iranian studio. it's a small surveillance drone. u.s. navy captains used them to watch their own ships. this is not an armed drone. if the iranians brought it down, the u.s. will see that as a very aggressive action. last month, the iranians tried to shoot down a u.s. drone in the same place. almost exactly a year ago, the iranians brought down a high-tech drone, one used by the cia. that was inside iranian territory. as you said, this will raise tensions in a very sensitive area. u.s. has thousands of service members in the gulf, just a few miles from iran. and the u.s. continues to accuse iran of trying to develop a nuclear weapon. ron? paula? >> nick schifrin with the latest from london. thank you, nick. we'll see you in just a moment. >>> also from london, kate middleton, the duchess of cambridge, is hospitalized there, for a second day. doctors ar